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phraseologist

American  
[frey-zee-ol-uh-jist] / ˌfreɪ ziˈɒl ə dʒɪst /

noun

  1. a person who treats of or is concerned with phraseology.

  2. a person who affects a particular phraseology or is skilled in coining phrases.


phraseologist British  
/ ˌfreɪzɪˈɒlədʒɪst /

noun

  1. a person who is interested in or collects phrases or who affects a particular phraseology

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of phraseologist

First recorded in 1705–15; phraseolog(y) + -ist